Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57ba107ab040155…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 22:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3842f6ea67e1657795e98946998463b4 SHA-1: ec6ecfc1ca56b672cd38a9785093b5fab631a2aa SHA-256: e57ba107ab040155a9f96e5ab83ddac9dd536d4ca542c3ae1922ae7a921d071b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It impersonates a document signing service, a common lure for phishing attacks. The document contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to distribute malicious content or host phishing pages. No scripts were extracted, but the presence of numerous external links and the impersonation lure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://homeopathyhongkong.org/files/16452471838.pdf In PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/vesovavogij.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613175b2de9e6---79914543171.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/goropidexapozutunixizedov.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ea0691c3f43df3fff07236c373950373/janisijififemat.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/54608088605.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/kuxojasozawafabasoruzepoj.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/xogaxakogedizewixoledolu.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/2516172561.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/bijuwipomigasadiwipefova.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/rajojopaxofopu.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/zavesigedowazuzaxunuv.pdfIn PDF document text
    • http://abpaluso.com/upload/file/tekejenaworobi.pdfIn PDF document text
    • http://vodnik48.ru/content/file/xaxodexu.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/6439412165.pdfIn PDF document text
    • https://beautydent.hu/editor_up/tixakewetofifazosar.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/74887048349.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7tqequ6qcuarve8lti6ok1m1dt/mofigabu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613954296f928---48486939944.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/10d5813c2acc1aa9b66bdf2a373162c2/luvofezanixulepivizerivot.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/vesalibig.pdfIn PDF document text
    • https://phr4u.com/files/tupomuduk.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ce74c656ffc3364049fb752b320aa2c/20473041459.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/23456340440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+read+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 17400 bytes
SHA-256: 610635990a82cac39af973aab87ae859fbf14291a3710d96f003628d2c15148f
font_02_sfnt_off00012e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E94 9956 bytes
SHA-256: 6163a780f3ec48883d16d45f449260d9eec0263d04ecc1eaffb9b0ae33e4c049

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